# Service campaign NCU \- 2026020005

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service campaign
- NHTSA id: 11029057
- Published by NHTSA: 2026\-02\-27
- Manufacturer's number: NCU \- 2026020005
- Manufacturer's date: 2026\-02\-28
- NHTSA component: ELECTRICAL SYSTEM; ENGINE

## NHTSA's summary

Mercedes\-Benz AG, the manufacturer of Mercedes\-Benz vehicles, has determined that on certain subject vehicles, the control unit software for the engine electronics does not correspond to the current series production configuration. This may cause the electrical fault diagnosis of the lambda sensor to not operate as intended, so that in the event of a fault, the check engine indicator lamp may not illuminate. MBUSA will conduct a service campaign. An authorized Mercedes\-Benz dealer will update the software for the engine electronics control unit on the affected vehicles.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029057-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029057-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Engine

## Vehicles listed

- 2020 to 2022 MERCEDES\-BENZ AMG CLA35
- 2020 MERCEDES\-BENZ AMG CLA35 4MATIC
- 2020 to 2022 MERCEDES\-BENZ AMG CLA45
- 2020 MERCEDES\-BENZ AMG CLA45 4MATIC
- 2021 to 2022 MERCEDES\-BENZ AMG GLA35
- 2020 to 2022 MERCEDES\-BENZ AMG GLA45
- 2021 MERCEDES\-BENZ AMG GLA45 S
- 2022 MERCEDES\-BENZ AMG SL43
- 2022 MERCEDES\-BENZ AMG SL55
- 2020 MERCEDES\-BENZ AMG SL63
- 2022 MERCEDES\-BENZ AMG SL63
- 2020 to 2022 MERCEDES\-BENZ CLA 250
- 2020 to 2021 MERCEDES\-BENZ CLA 250 4MATIC
- 2020 to 2022 MERCEDES\-BENZ GLA 250
- 2021 MERCEDES\-BENZ GLA 250 4MATIC

JSON: [/v1/bulletins/11029057](/v1/bulletins/11029057)

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